Mounting of conductors.



K. SGHR'O'TER.

MOUNTING OF GONDUG'I'ORS.

APPLIOATION FILED MAY 20, 1910.

980,843, Patented Jan. 3, 1911.

Fig. l.

Witnesses: Inventor:

w M Karl Schrb'tr",

His DIttorney.

Ni srnirs r i KARL SCHRi TER, 9F BERLIN, GERMANY, ASSIGNOR TO GENERALELECTRIC COMQANY, A COBEORATIGN (31 NEW YORK.

MOUNTING OF CONDUCTORS.

senses.

Specification of Letters Eatent.

Patent-ed Jan. 3, i913 To all whom it may concern:

Be it known that I, KARL SoHRornR, a subject of the Emperor of Germany,residing at Berlin, Germany, have invented certain new and usefulImprovements. in Mounting of Conductors, of which the following is aspecification.

My invention relates to the mounting of conductors, and it comprises aprocess therefor which is cheap and easy to carry out, and possessesvarious advantages which will appear from the specification following.

It frequently happens that after being mounted in proximity to somestructure (as, for example, its supporting system or holding devices)intended to be associated with it in an apparatus of which it isdesigned to form a part, a conductor is subjected to treatment liable toresult in the formation of a deposit on the structure in question. Sucha deposit may be formed, for instance, when material passes off from theconductor in'consequence of the passage of current through it. It issometimes desirable to insure thefinal absence of deposited material,and for this purpose treatment with chemical reagents which act uponthis material but do not attack the conductor or the structureassociated with it has been resorted to. Such treatment has thedisadvantage that in consequence of the necessity of avoiding injuryfrom the reagent used the range of materials that may be combined in theapparatus is not wholly unrestricted. In the process of the presentinvention, the use of such reagents is avoided; and the formation ofdeposits on the structure referred to is prevented by a protectivecoating thereon which is afterward removed.

My invention is applicable especially in connection with the manufactureof apparatus with filaments formed by the incorporation of material fromwhich the finished filament is. to be made with auxiliary material orhinder such that the resulting composition can be readily formed into afilamentary bodyand otherwise shaped as desired by various well-knownmethods, the auxiliary material being eliminated after completion of theshaping. Prior to the elimination of the auxiliary material, thefilament may be placed on the supporting system intended to ultimatelycarry 'it. This procedure is, in particular, practiced with metallicauxiliary material in the manufacture of electric lamps.

I have hereinafter described a mode in which my invention may be carriedout and applied in the manufacture of electric lamps; but I desire it tobe understood that the mode described is illustrative and that theinvention can be carried out and applied in other ways within the scopeof the appended claims.

In the drawings accompanying this specification and forming partthereof, Figure 1 IS a perspective view of an ordinary type of lampmountshown without the giobe in connection with which my invention maybe used; and Fig. 2 is a fragmentary diagrammatic section of the sameillustrating certain steps in the practice of my invention according tothe mode described.

The filament system or mount shown in Fig. 1 comprises the usual glassstem or carrier a through which the current supply leads Z, Z areintroduced into the lamp, :1 standard 7) of glass or other suitablematerial secured to said stem, and two sets of hooked arms or engagingelements 1: projecting from said standard by which the filament (Z iscarried.

In order to bring them into the form of wire, filament materialswhichare mechanically difiicult to work may, as above intimated, beincorporated with ductile metallic auxiliary material to form ductilecompositions which can readily be worked up and shaped. as desired. Theauxiliary material may be driven out of the wires thus produced bypassing an electric current. through them. If this conversion of thecrude filament into a finished filament is not elfected till after ithas been placed on its final supporting system, the metal expelled fromthe filament naturally forms deposits. When the filament stem shown inthe drawing is used, these eposits are formed especially on the axialstandard 6 and the engaging elements 0. Instead of treatment with acidsbeing resorted to for the removal of these deposits, a protectivecoating is, in accord ance with my invention, applied to the partsexposed to them before the filament is mounted and removed after theauxiliary material has been expelled. For example, the supporting systemmay be coated with a thin collodion film by dipping it in a solution ofcollodion in ether and alcohol; or it may be brushed over with asolution of paraffin in benzin, or with one of rubber in any suitableliquid,,such as carbon bisulfid. After the evaporation of the solvent,the supporting system remains covered with a coat ng 6 of collodion orthe like (Fig. 2). If the wire or filament is now placed on thesupporting system and the auxiliary material volat-ilized, fineparticles of this material are deposited on the protective coating, andin the subsequent removal of this coating by the solution the deposit isalso removed. As a solvent for collodion coatings, ether and alcohol isdesirable; for paraflin coatings, benzin; for rubber coatings, carbonbisulfid. Inasmuch as in this process the solvent need be capable onlyof issolving the protective coating and not the metallic deposit,neutral non-corrosive solvents are used instead of the corrosive fluids,such as acids, formerly necessary, and attack of the material of thesupporting system or of the filament is in consequence impossible.

It is desirable either to avoid coatingthese parts of the supportingsystem which attain a hi h temperature during the heating of thefilament to expel the auxiliary material or else to remove the coatingfrom them before the filament is put in place. (In Fig. 2 the protectivecoating 6 which covers the glass stem 1) is shown as leaving the arms 0exposed.) Such a course avoids any chemical alteration in the coatingwhich might occur at the more highly heated parts of the supportingsystem by carbonization of the organic coatingmaterial. It is to benoted that the formation of deposits on the parts thus left uncoveredmay 1n a measure be prevented by their high temperature during thepassage of current through the filament; whereas overheating of thecoating material might render it difficult to dissolve, or result in itsreacting with the part which it covers.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is,

1. The process which consists in applying a protective coating tostructure associated with a filament in the apparatus of which it formsa part, permanently mounting a filament in operative relation to suchstructure, passing current through said filament to expel materialtherefrom, and removing the coating.

2. The process which consists in applying a filament containing binderto a supporting system having a suitable protective coating, passingcurrent through the filament to volatilize said binder, and removingsaid coating from the supporting system.

3. The process which consists in subjecting a conductor permanentlymounted in its intended relation to structure associated with it in theapparatus of which it is designed to form a part to treatment liable toresult in the formation of a deposit on such structure and then removinga coating from said structure.

4. The process which consists in applying to a filament supportingsystem a protective coat-ing adapted to receive deposits of materialsexpelled from the filament during passage of current therethrough and tobe removed with them.

5. The process which consists in passing current through a conductorpermanently mounted in its intended relation to structure associatedwith it in the ap aratus of which it forms a part to expe materialtherefrom While all parts of such structure except those which attain ahigh temperature during the operation are covered with a protectivecoating and removing said coating along with deposited material from theconductor.

6. The process which consists in applying a soluble rotective coating toa lamp mount, placing a filamentary body containing ductile metal binderthereon, passing current throu h the filament to expel the binder, anddissolving the protective coating from the mount and thus removingmaterial of the binder deposited thereon.

7. A supporting system for a filament having a protective coatingadapted to re ceive deposits of material given oil from the filamentduring the passage of current therethrough and to be removed bytreatment which does not affect any part of the systom.

8. A supporting system for a filament having a protective coatingadapted to receive material deposited on the supporting system duringpassage of current through the filament and to be removed with suitablefluid along with such deposited material.

9. A filament mount comprising a filament containing material adapted tobe eliminated by passage of current through the filament and a glassstem having an organic protective coating adapted to receive 'materialdeposited from the filament and to be removed with suitable fluid.

10. The process which consists in passing current through a filamentmounted on a supporting system having a protective coating to expelbinding material from the filament and ren'loving the coating With 5suitable fluid along with any material deposited on the supportingsystem.

11. The process which consists in passing current through a filamentmounted on a supporting system having a soluble organic protectivecoating and dissolving away the 10 coating to remove any deposit formedon the supporting system.

In Witness whereof, I have hereunto set my hand this fourth day of May,1910.

KARL SCHROTER. Witnesses:

HENRY HAsPER, WOLDEMAR HAUPT.

